Mechanism for converting rotary to reciprocating motion



(No Model.) 2 Sheets-Sheet 1. J. W. BUTTERFIELD.

MECHANISM FOR CONVERTING ROTARY T0 RECIPROGATING MOTION Patented June 7,1898.

WITNESSES:

(N0 Model.)

I 2 Sheets-Sheet 2. J. W. BUTTERFIELD.

MECHANISM FOR CONVERTING ROTARY T0 REGIPROUATING MOTION. No; 605,218.

Patented June 7, 1898.

INVENTOR,

I I I r J r QMW BY AT ORNEY lJNrTED STATES PATENT FFICEI.

JOHN W.BUTTERFIELD, or COLUMBUS, 01 110.

MECHANISM FOR CONVERTING ROTARY T RECIPROCATING MOTION.

SPECIFIOATIQN forming part of Letters Patent No. 605,218, dated June '7, 1898. Application 1116a January19,1898. SerialNo-667,147. (No model.)

To all whom it may concern: Q

Be it known that I, J OHN W. BUTTERFIELD,

a citizen of the United States, residing at Go- Lumbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement iirMechanism for Converting Rotary to Reciprocating Motion, of which the following is a specification.

My invention relates to the improvement of mechanism for converting a rotary into a reciprocating motion; andthe objects of my invention are to provide a comparatively simple and reliable mechanism of this character by means of which a steady and uniform reciprocating motion is generated from a rotarymotion, to so construct and arrange the parts of the same as to reduce both friction and power, and to otherwise produce a simple, reliable, and efiective device of this kind which can be employedfor moving the beds of printing presses or for other similar purposes. These objects I accomplish in the manner illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of my improved mechanism. Fig. 2 is a similar View showing the driving-arms and movable parts in a different position from that indicated in Fig. 1. Fig. 8 is a plan view. Fig. 4 is a rear side elevation. Fig. 5 is a central transverse section on line a: w of Fig.1. Fig. 6 is a vertical section taken between the pinion-wheel and one of the driving-arm heads, and Fig. 7 is a detail sectional View on line z z of Fig. 2.

Similar numerals refer to similar parts throughout the several views.

In the construction of my improved mechanism I employ a main frame 1, which is preferably of the general oblong form shown and which may consist, as shown, 'of an upper horizontal arm 2, a similar lower arm 3,curved end arms 4, and a central longitudinal arm 5. WVithin this main frame and adjacent to the forward side of the arm 5 I provide a vertically-movable rack carrying oblong frame 6, of which 7 represents the vertical end bars. The frame 6 is provided at each end with upper and lower rearwardly-projecting guidelugs 8,-the latter being shown more clearly in Fig. 5 of the drawings, and through each pair of these guide-lugs passes loosely a vertical rod 9, which is fixed in the frame 1. Secured to front side of the upper and lower horizontal bars of the frame 6 are horizontal andpar= allel rack-bars, which are indicated, respec tively, at 10 and 11, and the teeth of one of said rack-bars projecting toward the teeth of the other.

Formed or secured upon the front face of each of the curved end arms or bars 4 of the main frame 1is a track-segment, these segments being indicated at 12 and 13 and be ing, as indicated more clearly in Fig. 7 of the drawings, of a dovetailed form in cross-see tion.

14 represents opposing driving-arms, each of the latter having formed with its outer end an enlarged head 15, thelatter being formed with an outwardly projecting inwardlyturned C or crescent-shaped flange 16. Projecting from said head is a pin 17, which is concentric with the inner wall of the C-fiange 16, said pin preferably having an enlarged outer end or head 18. Each of the heads 15 has its rear side provided with a grooved channel of a dovetailed form, as indicated at 15 in Fig.7, this channel embracing loosely the adjoining correspondingly-shaped tracks 12 and 13. At a point 19 in the inner end portion of each of the driving-arms 14 said arm is fulcrumed tothe central bar 5 of the frame 1, while said inner end portions of said driving-arms terminate in opposing gear-seg ments 20, the teethof which are adaptedto mesh one with the other, as shown. Between the gear-segments 20 and the fulcrum-points length with the racks 10 or 11 and, has-formed.

in its otherwise toothed periphery at the proper point a rounded recess 25, whichis adapted, as indicated'in the drawings,'to receive alternately during the operationof the mechanism the projecting pins 17 of the driving-arm heads.

In the drawings I have shown the frame 1 secured to the under side of the machine bed- .tance between the toothed surfaces of the racks 10 and 11.

As indicated in section in Fig. 6, in full lines in Fig. 5, and in dotted lines in Fig. 2,

I provide the inner side of the pinion 23 with a rearwardly-projecting journaled roller 27.

In orderto illustrate the operation of converting the rotary motion, suitably imparted to the shaft 24, to'a reciprocating motion of the plate or frame part 26, Iwill assume that the parts are in the position indicated in Fig. i 2 of the drawings-that is, that the driving arms are in horizontal alinement with each other, that the driving-arm heads are central on the tracks 12 and 13',and that the projecting pin 17 of that head which is on the track 12 is within the recess 25 of the pinion 23. Rotary motion being now imparted in any suitable manner to the shaft 24, in the direction indicated by the arrow in said Fig. 2, it-is obvious that the head 15, which is on the track 12, will be carried upward on said track until the teeth of the pinion are thrown into engagement with the under side of the upper rack-bar 10. Owing to the connection of the gear-segments 20 it is obvious that the driving-arm head 15 at the opposite end of the p gage alternately with said rack-bars, the pins T of said driving-arm heads adapted t'o'engage ias described with said pinion-recesses and machine will likewise be carried upward on the track 13. In the movement thus imparted to the driving-arms it is obvious that the same-, owin g to their fulcrum connection with the lower portion of the frame 6 through thebars 21, cause a lowering of said frame 6 thereby, is'in proper alinement with the teeth of thepinionto receive the latter. The rotary motion of the shaft being continued, it is obvious that the engagement of the teeth of the gear-wheel with the upper rack must result in carrying the connected frames 1 and 6 in the direction indicated by'the dotted arrow in said Fig. 2, and consequently'in a corresponding movement of the bed-plate 26, with which said frame 1 is connected. When the rack-bar has passed out of engagement with the pinion-wheel, it is obvious that the motion of the frames in the direction of the dotted arrow will be continued by the en-;

gagement of the pin 17 of that head 15 which is on the track 13 with the recess 25 of said pinion. The continued rotation of the shaft results in the head on the track 13 traveling of the main and rack-carrying frames will be reve'rsed and that-this reversed movement will continue until the pinion has passed over ,the opposite end of the lower rack'and the head on the track 13 has passed the center of the latterin its upward movement. During the engagement of the pins 17 of the heads with the pinion-recess it will be seen that'a proper engagement ofsaid pinions and pins will be assured, from the fact that the guide-rollers 27 of the pinionare traveling ;against the inner walls of the head-flanges.

It will be observed that through the rotary nnotion of the' shafta desirable reciprocating motion of the frames and bed-plate 26 is imparted and that this is accomplished-without.

l undue friction of the parts.

Having now fully described my invention,

! what I claim, and desireto secure by Letters Patent, is'

1-. In a mechanism for converting'rotary to reciprocating motion, the combination with a frame 1 having curved end tracks, driving- ?arms fulcrumed-to said frame and having a 1 segmental gearconnection at theirinner ends,

headson'theouter ends of said driving-arms, 1' said heads having asliding connection with 7 said tracks, and a pin projecting from each of said heads, of a vertically-movable frame 6,,an upper and lower rack-bar carried theref on, bars 21 jointedly connecting said frame 6 and driving-arm a power-shaft and'a pinionwheel on said shaft having a peripheral recess, the teeth of said pinion adapted to en'- a guide projection on saidpinion adapted to travel in guideways on said heads, substan- I tially as and for the purpose specified.

until the upper rack-bar 10, which is carried P reciprocating motion, the combination with a frame 1, a curved track on each end thereof, flopposing' driving-arms fulcrumed to said 2'. Ina mechanism for converting rotary to frame 1 and having a segmental gear connec- 1 tion attheirinne'r ends, and a head on each 1 of said driving arms, a guideway on each of isaid heads said heads-having a sliding con nection with said end tracks and a projecting pin on each of said heads, of a frame 6 vertically movable in said frame 1, bars 21 j ointedly connecting said driving-arms and said specified.

3. In a mechanism for converting rotary to ireciprocating motion, the combination with a frame 1, a'curved track on each end thereof, opposing driving arms fulcru med -to said frame 1, driving-arm heads having a sliding connection with said tracks, a curved flange on each of said heads, and a pin projecting from each of said heads-concentric with the curve of said flange, of a vertically-movable frame 6 connected with said frame 1 and having a jointed connection with the drivingarms, a rotary shaft; 24, a pinion 23 thereon, a peripheral recess in said pinion adapted to receive as described said head-pins and a roller projecting from said pinion and adapted to travel against said head-fianges substantially as and for the purpose specified.

JOHN \V. BUTTERFIELD'.

In presence of--- G. O. SHEPHERD, CHARLES CASE. 

